WCF and HTTP Error 404.3 – Not Found

In the web world, a 404 error is usually self-explanatory–whatever page you’re requesting simply isn’t there.

However, there are different variations of the 404 error. The 404.3 error is different from the typical 404 error in that the item you request may actually exist on the server. It’s just that the server can’t process it. One of the descriptions that you might get with this is

The page you are requesting cannot be served because of the extension of the configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

If you’re attempting to access a WCF service, the issue may be that the web server may not have WCF correctly installed and configured. To solve this problem, execute the Service Model Registration tool to enable WCF on IIS.  To do so, just run the following from a command line as an Administrator:

"%windir%\Microsoft.NET\Framework\v3.0\Windows Communication Foundation\ServiceModelReg.exe" -r -y

The following article provides a great step-by-step on how to setup a WCF service on IIS 7, including the above step to register WCF components:


About Ed Jones

Ed is a .NET and Integration architect for Avanade in the Twin Cities. Contact Ed

2 responses to “WCF and HTTP Error 404.3 – Not Found”

What do you think?

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: